|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Cetacea - Delphinidae
It was synonymized subjectively with Lagenorhynchus by Hershkovitz (1966), McKenna and Bell (1997), Rice (1998) and Mead and Brownell (2005); it was reranked as Leucopleurus by Gray (1868), Gray (1870), Palmer (1904), LeDuc et al. (1999), Fordyce and de Muizon (2001), Geisler et al. (2011), Perrin et al. (2013), Murakami et al. (2014) and Vollmer et al. (2019).
It was assigned to Lagenorhynchus by Gray (1866); to Lagenorhynchina by Gray (1868); and to Delphinidae by Gray (1870), Palmer (1904), LeDuc et al. (1999), Fordyce and de Muizon (2001), Geisler et al. (2011), Perrin et al. (2013), Murakami et al. (2014) and Vollmer et al. (2019).
|Year||Name and author|
|1866||Lagenorhynchus (Leucopleurus) Gray p. 216|
|1868||Leucopleurus Gray p. 7|
|1870||Leucopleurus Gray p. 772|
|1904||Leucopleurus Palmer p. 374|
|1999||Leucopleurus LeDuc et al. p. 639 figs. Figure 2|
|2001||Leucopleurus Fordyce and de Muizon p. 179|
|2011||Leucopleurus Geisler et al. p. 6 figs. Table 1|
|2013||Leucopleurus Perrin et al. p. 571 figs. Table 1|
|2014||Leucopleurus Murakami et al. p. 507 figs. Figure 10|
|2019||Leucopleurus Vollmer et al.|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|N. L. Vollmer et al. 2019||Leucopleurus acutus partially overlaps in distribution with L. albirostris across the North Atlantic and can be differentiated based on the presence of a sharply defined color pattern, in part consisting of a dark gray to black upper jaw and entire dorsal surface, a white lateral patch starting below the dorsal fin and extending posteriorly, a white belly and lower jaw, black flippers, and a yellow or tan blaze along the flank. From a lat- eral view, the tail stock abruptly tapers prior to the flukes. Compared to L. albirostris, L. acutus has a longer and narrower skull (Reeves et al. 1999b). Additionally, L. acutus can be distinguished from all Sagmatias species based on having the largest lachrymal length and greatest preorbi- tal width (Miyazaki and Shikano 1997b).
Molecular evidence based on both nuclear and mitochondrial DNA data supports that L. acutus is differentiated from Lagenorhynchus albirostris and all species of Sagmatias, Cephalorhynchus, and Lissodel- phis with high statistical support based on phylogenetic bootstrap and PP values (Fig. 2, 3; Table 4). These studies reveal that L. acutus has no close genetic affinity to any other species, supporting the monotypic sta- tus of this genus.